Pulverizer



Au so, 1938.

C. T. ELDERKIN PULVERIZER Filed June 28, 1937 'INVENTOR. 6'44: 7'..ELDERK/N.

W) [ITO KNEW.

" Patented Aug.30, '193 8 UNITED STATES PATENT. OFFICE runvnnrzaa Clair'1. Elderkin, Sacramento, Oalif., assignor to Irven T. Miller, Woodland,Galif.

Application June 28,1937, Serial-No. 150.735 I 6 Claims.

vide a number of improvements in the type of mill l struction'.

More particularly it is proposed to provide for a better control of theair currents passing through the mill whereby a more generous amount ofair is.

made to circulate through the mill and eddy cur-'- rents are by-passedand made to join the main current so that all dead air pockets areavoided. It is further proposed to arrange the rotor or beater in themachine in such a manner that the material under treatment is evenlydistributed g through the housing.

It is further proposed in the present invention to provide means on therotor for dragging hay from the entrance into the housing whereby thefeeding of the hay is improved particularly where the hay is fed in theform of bales, or shows a tendency to bunch at the entrance to thehousing It is a further object of my invention to provide improvedmounting means for the motor whereby the weight is balanced to betteradvantage than in existing mills.

And finally it is proposed to provide certain improvements inconstruction whereby the mill is simplified andmore easily assembled.

l Further objects and advantages of my inven- I tion will appear as thespecification proceeds.

The preferred form of 'my invention is illustrated in theaccompanyingdrawing in which- Figure 1 shows a vertical transverse section 5 throughmy mill,

v Figure 2'an axial section taken along line 2-2 of Figure 1, and

Figure 3 a detail view of a heater and associated parts as seen fromline 3-3 of Figure 1.

, 50 While I have shown only the preferred form of my invention I wishto have it understood that various changes or modifications may be madewithin'the scope of the claims hereto attached Rassuin AUG 1940 that thefeatures of my invention are not conflnedto an alfalfa mill but may beused in connection with any material having similar characteristics,

Referring to the drawing in detail, my milli 5 may be supported on anysuitable base. 2 which is hereillustrated a's composing four angleiron's 3 arranged in rectangular relation and joined by a plate 4. Themill comprises a housing 5 and a rotor 6 confined in the same. i

The housing is made of two end plates I and 8 rising vertically from thebase in spaced and parallel relation and being secured thereto by meansofflanges 9 and iii. The plates are of I identical form and eachcomprises a rectangular body'section II and a tapered top section l2.Between the plates is supported the shell of the housing comprising asemi-cylindrical section l3, vertical sections it and IS rising from theupper edges of the semi-cylindrical section and inclined sections i6 andi1 tapering toward one another and terminating in a restricted outletit, which latter connects, through a conduit i8, with a cyclonecollector not shown.

In manufacturing the pulverizer, 1 preferably make the semi-cylindricalsection IS, the vertical sections l 4 and i5 and the inclined sectionsit and I! in one piece, referred to as shell i9, and the latter isclamped between the rear plate 8 and-the front plate I by a series ofbolts 28 surrounding the shell as shownin the drawing.

In the housing is supported a screen or perforated plate 23 which issemi-cylindrical inform and is secured to the vertical shell sections itv and i5 by means of bolts-2| in such a manner 3 that it complements thelower semi-cylindrical section to form a complete cylinder. a

The rear plate 8 is preferably made with a re-' movable middle section8'for facilitating the in sertion and removal of the screen.

' It will be noted that the inclined shell sections l8 and I! are spacedfrom the screen sufllciently to form pockets 24 and 25 respectively, andin order to control and-provide an outlet for eddy cmrents that may formin those pockets, I provide two baiiles 28 and 21 which'run parallel tothe inclined shell sections it and "and the walls of the outlet It so ast6 form'by-pesses 28 and 29. The baflies-are welded to the front plate Iand contact the rear plate 8.

Inside of thecylinder I -provide the rotor or. heater .6 mounted on theshaft 80. The rotor comprises a flat plate 8|, mounted-seas to becloserto the rear plate 8 than to the front plate l, as shown in Figure 2, andhaving a'plurality 5 plate during its rotation.

The front plate has a large entrance opening ll which connects with atrough 35 which latter is preferably inclined to feed hay into the millby gravity. In order to facilitate the feeding, particularly of baledhay, I provide a number of prongs 38 on the rotor, the prongs beingarrangedopposite the opening so as to tear into the hay projectingthrough the opening and to drag the hay into the mill. The prongs arepreferabiy arranged at difierent distances from the axis of rotation sothat they attack the different points. v

The shaft 30 is mounted, outside of the housing, in: bearings 31 andcarries, at its outer end, a pulley wit to which power may be applied inhay at any suitable manner. It will be noted that the.

pulley and the rotor are mounted on opposite sides of the bearings sothat they tend to balance one another.

4 'Iheoperation of the mill should be readily understood from theforegoing description. The hay is fed, loose or in bales, over thetrough into the cylinder. If the hay is closely compressed, as in bales,or otherwise bunched, the prongs It. of the revolving rotor will tear itup and drag it into the mill. "The beaters then act on the hay topuiverize it; At the. same time a draftof air, is set up, the air comingin through the opening 84 and being discharged through the scrum whichlatter is of relatively thin material and holds back portions of the haywhich have not been sufliciently, reduced.

' The normal tendency of the air, which carries the pulverized materialalong with it, is to discharge in tangential direction. Since the rotorrotates clockwise, (see Figure l) the laden air will first dischargeinto the pocket 24 and through the by-pass 28 which lies practically inthe normal path of air discharged by centrifugal force.

A d'urther portion of the air will, of course, discharge into the mainchannel of the discharge conduit, that is into the hood formed by thebailles 26 and 21.

lbs major part of this air will also move upward. A remaining portion ofair, finally, will reach the pocket 25 but, instead of returning intothe mill, will be drawn upward into the by-pass "on account of suctioncreated by the air forced through the conduit '8. Thus air may be dis- 2charged through practically the entire screen area to insure a free flowand with such a large exhaust area available, the intake may beincreased correspondingly, as compared with mills now on the market.

The angular position of the heaters serves to better distribute thematerial throughout the mill.

Where straight blades are used I 'flnd that usually only the frontportion of the mill renders eifecing from the edges of the bottomsection and inclined sections rising from the vertical sections andtapering to a restricted-outlet, a semi-cylindrical screen arranged inthe housing complementary to the bottom section and forming pocketswiththe side sections and means for bypassing eddy currents formed in thepockets into the outlet.

drical screen extending between the end walls with its concave facepresented downwardly in complementary relation with the'bottom sectionand coacting with the latter to define a cylindrical reducing chamber;the screen forming pockets with the side sections; means for introducingmaterial into the reducing chamber; a rotor in the reducing chamberhaving beate'rs thereon; and a pair of baflles mounted in substantiallyparallel relation with the inclined housing sectionsand coactingtherewith to provide by-passes leading directly from the pockets to. thehousing outlet; the baiiles being spaced from each other to define amain outlet therebetween.

3. ha pulverizer; a housing havingend walls,; .a semi-cylindrical bottomsection, vertical side sections rising from the bottom section, andinclined sections rising from thevertical sections and tapering to arestricted outlet; a semi-cylindrical screen extending between the endwalls with its concave face presented downwardly in complementaryrelation with the bottom section and coasting with the latter to definea cylindrical reducing chamber; the screen forming pockets with the sidesections; means for introducing material into the reducing chamber; arotor in the reducing chamber having beaters thereon; and a pair ofbabies mounted in substantially parallel relation with the inclinedhousing sections and coacting therewith to provide by-passes leadingdirectly from the pockets to the housing outlet; the bailiesbeing-spaced from each other to define a main outlet therebetween; themain outlet having a greater cross-sectional area than either. by-pass.V

'4. Ina pulverizer; a housing having end walls. a semi-cylindricalbottom section, vertical side sections rising from the bottom section,and inclined sectionstrising from the vertical sectionsand tapering to arestricted outlet; asemi-cylindrical screen extending between the endwalls with its concave face presented downwardly in complementaryrelation with the bottom section and coacting with the latter to definea cylindrical reducing chamber; the screen forming pockets with the sidesections; means for introducing material into the reducing. chamber; arotor in the" reducing chamber having beaters thereon; and a pair ofbattles mounted in substantially parallel.-

relation with the inclined housing sections and coacting therewith toprovide by-passes leading directly from the pockets to the housingoutlet;

. the bailles being spaced from each other to define a'main'outlettherebetween the lower ends of the a-semi-cylindrical bottom section,vertical side sections rising from the bottom section, and inclinedsections rising from the vertical sections v 2,128,787 and tapering to arestricted outlet; a semi-cylindrical screen extending between the endwalls with its concave face presented downwardly in complementaryrelation-with the bottom section and coacting with the latter to definea cylindrical reducing chamber; the screen forming pockets with the sidesections; means for introducing ma terial into the reducing chamber; arotor in the reducing chamber having beaters thereon; and a pair oifbailies mounted in substantially parallel relation with the inclinedhousing sections and ooacting therewith to provide by-passes leadingdirectly from the pockets to the housing outlet; the baijlles beingspaced from each other to define a main outlet therebetween; the housingand 'banies being symmetrically disposed on opposite clined sections andtapering to a restricted outlet; a semi-cylindrical screen extendingbetween the end walls with its concave iaee presented downwardly-incomplementary relation with the bottom section and coasting with thelatter to define a cylindrical reducing chambenjzhe screen formingpools-'- rising from the vertical sections ets with the side sections;means for introducing U material into the reducing chamber; a rotorinthe reducing chamberhavingbeaters thereo and a pair 01 bailies mountedin substantially parallel relation with theinclined housing sections andcoacting therewith to provide by-passes leading directly from thepockets to the housins outlet; the battles: being spaced from each otherto define a main outlet therebetween; one end wall having a removablesection extending above and below the screen to allow lateral removal ofthe screen.

cum r. Emnaxm. m

